Based on the outputs of the function, it seems that f(x) is selective for the concept of "feudalism" and "knights". Both "feudalism" and "knights" have high output values close to 1, indicating a strong association with the concept. On the other hand, words like "script", "security", "thought", "physics", "Twitter", "Dublin", "French Revolution", and "badminton" have low output values close to 0, indicating a weak association with the concept. 

Therefore, a good description of f(x) could be:

[DESCRIPTION]: The function f(x) implemented by the script appears to be selective for the concepts of "feudalism" and "knights", where a value closer to 1 indicates a strong association with these concepts. Other words tested, such as "script", "security", "thought", "physics", "Twitter", "Dublin", "French Revolution", and "badminton", show weaker associations with the concept, as indicated by lower output values closer to 0.